Jacob did place one disclaimer on that total of 25 concussions. Not all of them have come via snowboarding. Jacob is also a well-known daredevil with a chair lift, a skateboard and a dirtbike (see the videos below) and has achieved plenty of fame as a testing-the-limits performer in Travis Pastrana's Nitro Circus. "Trevor Jacob ... escapes death" was one of Google's top auto-fill suggestions when I was researching this post.

Still, one concussion let alone 25 is serious cause for concern. At what point does Jacob rein in his behavior to prevent even more injury to his brain?